I am running a PX-716SA and it's sweet. (I also bought a USB2.0 one for the future)
I guess you need to spec a motherboard with a parallel ATA connection for the A version.
Download the latest version of Plextools pro XL (I am not sure of the version no. as I type, sorry)
Have not quite completed migration as I have had no time to get my head round WL 7.0 and install SADiE(to see if it works even?).
cheers